(m+11n)^2
=(m+11n)(m+11n)
=m^2+11mn+11mn+121n^2
=m^2+22mn×121n^2
For Example;
use FOIL: (a+b)(a+b)
First. a^2
Outside. ab
Inside. ab
Last. b^2
Remember that complementary angles are the angles whose sum is 90 degrees, so for example if angle

and angle

are complementary; then

.
In our case we have an angle a whose measure is 42° and and angle b, repented by x, whose measure we don't know; similarly:

We can conclude that the equation that represents this situation with x representing the measure of ∠b is <span>
42+x=90.</span>
The bottom line is a straight line that is equal to 180 degrees.
The three angles above it all need to add together to equal 180.
One angle is given as 20, so the other two need to add together to equal 160 ( 180-20 = 160)
Those two angles form the angle ACE so the answer would be 160 degrees,
Answer 160 degrees.
Answer:
that one is already correct